valid address space ?

[Abu Rasheda]

I am trying to dump some kernel data structure (walk e.g. task or file
data structure  on x86_64 arch). Sometime accessing through a pointer,
pointer may not be NULL, but pointing to invalid address due to garbage
value.

What I am looking for is range of address which are valid for kernel
data structure. Is it correct to say following address are valid ?

- Bit 0 - 47 are considered
- Between FFFF8000'00000000 through FFFFFFFF'FFFFFFFF
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